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"""
Airflow System Test DAG that verifies Datastore rollback operators.
"""
from __future__ import annotations

import os
from datetime import datetime
from typing import Any

from airflow import models
from airflow.providers.google.cloud.operators.datastore import (
    CloudDatastoreBeginTransactionOperator,
    CloudDatastoreRollbackOperator,
)

ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
PROJECT_ID = os.environ.get("SYSTEM_TESTS_GCP_PROJECT")

DAG_ID = "datastore_rollback"

TRANSACTION_OPTIONS: dict[str, Any] = {"readWrite": {}}


with models.DAG(
    DAG_ID,
    schedule="@once",
    start_date=datetime(2021, 1, 1),
    catchup=False,
    tags=["datastore", "example"],
) as dag:
    begin_transaction_to_rollback = CloudDatastoreBeginTransactionOperator(
        task_id="begin_transaction_to_rollback",
        transaction_options=TRANSACTION_OPTIONS,
        project_id=PROJECT_ID,
    )

    # [START how_to_rollback_transaction]
    rollback_transaction = CloudDatastoreRollbackOperator(
        task_id="rollback_transaction",
        transaction=begin_transaction_to_rollback.output,
    )
    # [END how_to_rollback_transaction]

    begin_transaction_to_rollback >> rollback_transaction


from tests.system.utils import get_test_run  # noqa: E402

# Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)
test_run = get_test_run(dag)
